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Algebraic Identities

Question

Expand: $(2 t + 5) (2 t - 5)$

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Solution

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Given that: $(2 t + 5)$ $(2 t - 5)$
$=$ $2 t (2 t - 5) - 5 (2 t - 5)$
$=$ $4 t^{2} - 10 t - 10 t + 25$
Hence $4 t^{2} - 20 t + 25$ is the correct answer

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(2 t + 5) (2 t - 5)

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